Add current, previous and next sales forms to form handler

app/models/form_handler.rb

@@ -16,7 +16,10 @@ class FormHandler
 
   def sales_forms
     sales_sections = [] # Add section classes here e.g. Form::Sales::Property::Sections::PropertyInformation
-    { "2022_2023_sales" => Form.new(nil, "2022_2023_sales", sales_sections, "sales") }
+    { "2022_2023_sales" => Form.new(nil, "2022_2023_sales", sales_sections, "sales"),
+      "current_sales" => Form.new(nil, "#{current_collection_start_year}_#{current_collection_start_year + 1}_sales", sales_sections, "sales"),
+      "previous_sales" => Form.new(nil, "#{current_collection_start_year - 1}_#{current_collection_start_year}_sales", sales_sections, "sales"),
+      "next_sales" => Form.new(nil, "#{current_collection_start_year + 1}_#{current_collection_start_year + 2}_sales", sales_sections, "sales") }
   end
 
   def lettings_forms

spec/models/form_handler_spec.rb

@@ -59,6 +59,30 @@ RSpec.describe FormHandler do
       expect(form).to be_a(Form)
       expect(form.pages.count).to eq(45)
     end
+
+    it "is able to load a current sales form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("current_sales")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(1)
+      expect(form.name).to eq("2022_2023_sales")
+    end
+
+    it "is able to load a previous sales form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("previous_sales")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(1)
+      expect(form.name).to eq("2021_2022_sales")
+    end
+
+    it "is able to load a next sales form" do
+      form_handler = described_class.instance
+      form = form_handler.get_form("next_sales")
+      expect(form).to be_a(Form)
+      expect(form.pages.count).to eq(1)
+      expect(form.name).to eq("2023_2024_sales")
+    end
   end
 
   describe "Current form" do